JP5542484B2 - Resin pipe fitting - Google Patents

Resin pipe fitting Download PDF

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JP5542484B2
JP5542484B2 JP2010055591A JP2010055591A JP5542484B2 JP 5542484 B2 JP5542484 B2 JP 5542484B2 JP 2010055591 A JP2010055591 A JP 2010055591A JP 2010055591 A JP2010055591 A JP 2010055591A JP 5542484 B2 JP5542484 B2 JP 5542484B2
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diameter
tube
fitted
retaining
enlarged
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JP2011190832A (en
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良 今西
一清 手嶋
貴之 岸本
昭宏 増田
健 中川
清敬 大前
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Nippon Pillar Packing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
    • F16L47/041—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe the plastic pipe end being flared either before or during the making of the connection

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Description

本発明は、流体移送路としてのチューブを拡径（フレア）させて接続させる構造の樹脂管継手に係り、詳しくは、半導体製造や医療・医薬品製造、食品加工、化学工業等の各種技術分野の製造工程で取り扱われる高純度液や超純水の配管にも好適であって、ポンプ、バルブ、フィルタ等の流体機器や流体移送路であるチューブの接続手段として用いられる樹脂管継手に関するものである。   The present invention relates to a resin pipe joint having a structure in which a tube as a fluid transfer path is expanded (flared) and connected, and more specifically, in various technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, chemical industry, etc. It is also suitable for piping of high-purity liquid and ultrapure water handled in the manufacturing process, and relates to a resin pipe joint used as a connecting means of a tube that is a fluid device such as a pump, a valve, a filter, or a fluid transfer path. .

この種の樹脂管継手としては、特許文献１において開示されるチューブ継手が知られている。即ち、合成樹脂製のチューブ１を継手本体４のインナ筒部５に強制的に押し込むか、又は特許文献１の図２に示されるように、予めチューブ端部２を拡径させてからインナ筒部５に嵌め込むかする。それから、予めチューブに嵌装されているユニオンナット６を継手本体に螺合させ、締込み操作して継手本体４の軸心方向に強制移動させることにより、チューブ１の拡径付け根部分２ａをエッヂ部６ａで軸心方向に強く押圧し、チューブ１とインナ筒部５との間をシールする構造である。   As this type of resin pipe joint, a tube joint disclosed in Patent Document 1 is known. That is, the tube 1 made of synthetic resin is forcibly pushed into the inner tube portion 5 of the joint body 4 or, as shown in FIG. It fits in part 5. Then, the union nut 6 fitted in the tube in advance is screwed into the joint body, and is tightened to forcibly move in the axial direction of the joint body 4, so that the enlarged root portion 2 a of the tube 1 is edged. This is a structure in which the portion 6 a is pressed strongly in the axial direction to seal between the tube 1 and the inner cylinder portion 5.

上述の構造と同様なものとしては、特許文献２の図８，図９において開示されたものや、特許文献３の図６において開示された樹脂管継手が知られている。これらのように、チューブの先端を拡径（フレア）させて継手本体に嵌めてナット止めする継手構造は、特許文献２の図５や特許文献３の図５等において開示される構造、即ち、専用部品のインナーリングに拡径外嵌されているチューブ端を継手本体の筒状受口に内嵌させてユニオンナット止めする３部品構造の管継手に比べて、継手本体とユニオンナットという少ない部品点数（２点）で経済的に管継手を構成しながらも良好なシール機能が得られる利点がある。   As the structure similar to the above-described structure, the one disclosed in FIGS. 8 and 9 of Patent Document 2 and the resin pipe joint disclosed in FIG. 6 of Patent Document 3 are known. As described above, the joint structure in which the tip of the tube is expanded (flared), fitted to the joint body, and fastened with a nut is the structure disclosed in FIG. 5 of Patent Document 2, FIG. 5 of Patent Document 3, and the like, Compared to a three-part tube fitting in which the tube end, which is externally expanded on the inner ring of the dedicated part, is fitted into the tubular receptacle of the joint body and fastened with a union nut, the joint body and union nut are fewer parts There is an advantage that a good sealing function can be obtained while economically constituting a pipe joint with two points.

ところが、上述のように２点部品で成る従来の樹脂管継手では、チューブ端を拡径させて強固に嵌合させ、かつ、拡径根元部分をユニオンナットで締付けているが、その締付けはシール機能を出すためのものであるためか、チューブを継手本体から引抜こうとする力には比較的弱いという傾向があった。チューブが引抜き移動されること自体が問題であるが、それによってエッヂ部の押圧によるシールポイントもずれてしまい、シール性に悪影響が生じる問題もある。特に、１００℃以上の高温流体を扱うべく樹脂管継手がフッ素樹脂等の大きな膨張係数を有する樹脂材料で形成されている場合には、それらの問題がより顕著化されてしまう。   However, in the conventional resin pipe joint composed of two parts as described above, the tube end is expanded and firmly fitted, and the expanded root portion is tightened with a union nut. There was a tendency for the force to pull out the tube from the joint body to be relatively weak, probably because it was for the purpose of functioning. Although the tube itself is pulled out and moved, there is also a problem that the sealing point due to the pressing of the edge portion is also shifted and the sealing performance is adversely affected. In particular, when the resin pipe joint is formed of a resin material having a large expansion coefficient such as a fluororesin so as to handle a high temperature fluid of 100 ° C. or higher, those problems become more prominent.

そこで、特許文献４にて開示されるように、チューブ拡径部とユニオンナットとの間にＣ字状の割リングをチューブ拡径部の周溝に嵌る状態で介装させる構造の耐引抜手段を設けることにより、シール機能だけでなくチューブの引抜に対しても強い樹脂管継手を得ることが知られている。しかしながら、その特許文献４で開示される樹脂管継手では、予めチューブ拡径部に周溝を形成する前処理が必要になるとともに、部品点数が増えて３部品となることから、元々有していた経済性の良さが損われてしまうという新たな問題が生じる。従って、継手本体とユニオンナットとの２点で成る樹脂管継手を、その新たな問題を招くことなく引抜に対しても強いものとするにはさらなる改善の余地が残されているものであった。   Therefore, as disclosed in Patent Document 4, a drawing-proof means having a structure in which a C-shaped split ring is interposed between the tube enlarged portion and the union nut in a state of being fitted in the circumferential groove of the tube enlarged portion. It is known to provide a resin pipe joint that is strong not only for the sealing function but also for pulling out the tube. However, the resin pipe joint disclosed in Patent Document 4 requires a pre-treatment for forming a circumferential groove in the tube enlarged portion in advance, and the number of parts is increased to 3 parts. A new problem arises that the economic efficiency is impaired. Therefore, there is still room for further improvement in making the resin pipe joint consisting of the joint body and the union nut strong against pulling out without causing new problems. .

実登３０４１８９９号公報Noto 3041899 gazette 特開平７−２７２７４号公報Japanese Patent Laid-Open No. 7-27274 特開２００２−３５７２９４号公報JP 2002-357294 A 実登２５８７４４９号公報Noto 2587449 gazette

本発明の目的は、上記実情に鑑みて、継手本体とユニオンナットとの２点で成る経済的なものとしながら、耐引抜性と良好なシール性との両立を図ることが可能となる樹脂管継手を提供する点にある。   In view of the above circumstances, an object of the present invention is a resin pipe that can achieve both a pull-out resistance and a good sealing property while being economical, consisting of a joint body and a union nut. The point is to provide a joint.

請求項１に係る発明は、樹脂管継手において、合成樹脂製チューブ３を徐々に拡径させる先端先窄まり筒部４Ａ、前記先端先窄まり筒部４Ａの大径側に続いて形成される直胴筒部４Ｂ、及び前記直胴筒部４Ｂの先端先窄まり筒部側に前記直胴筒部４Ｂよりも大径の状態で形成される抜止め環状部４Ｃを有するインナ筒部４と、雄ねじ５とを備える合成樹脂製の継手本体１、及び
前記雄ねじ５に螺合可能な雌ねじ８と、前記チューブ３の拡径部３Ａにおける拡径変化領域９に作用可能なシール用押圧部１０と、前記拡径部３Ａの前記直胴筒部４Ｂに外囲される拡径主部１２に外嵌可能な押え内周部１３と、を備える合成樹脂製のユニオンナット２を有し、
前記インナ筒部４に前記チューブ３が外嵌装着されて前記拡径部３Ａが形成される状態における前記雌ねじ８を前記雄ねじ５に螺合させての前記ユニオンナット２の前記継手本体１の軸心Ｐ方向への螺進により、前記拡径主部１２における前記抜止め環状部４Ｃに外囲される部分に前記押え内周部１３が圧接外嵌され、かつ、前記拡径変化領域９が前記シール用押圧部１０で前記軸心Ｐ方向に押圧されるように構成されており、
前記抜止め環状部４Ｃが、前記直胴筒部４Ｂからこれと外径を同じくして前記先端先窄まり筒部４Ａ側に延設される薄肉筒状部４Ｈの径外側へ向けて折り返されて形成されるものであることを特徴とするものである。 According to the first aspect of the present invention, in the resin pipe joint, the tip tapered tube portion 4A for gradually expanding the diameter of the synthetic resin tube 3 is formed following the large diameter side of the tip tapered tube portion 4A. An inner cylinder portion 4B having a straight barrel portion 4B and a retaining annular portion 4C formed in a larger diameter than the straight barrel portion 4B on the side of the tapered portion of the straight barrel portion 4B. , A synthetic resin joint body 1 having a male screw 5, a female screw 8 that can be screwed to the male screw 5, and a seal pressing portion 10 that can act on a diameter expansion change region 9 in the diameter expansion portion 3 </ b> A of the tube 3. A union nut 2 made of a synthetic resin, and a presser inner peripheral portion 13 that can be fitted onto the enlarged diameter main portion 12 surrounded by the straight barrel portion 4B of the enlarged diameter portion 3A.
The shaft of the joint body 1 of the union nut 2 in which the female screw 8 is screwed into the male screw 5 in a state where the tube 3 is fitted on the inner cylinder portion 4 to form the enlarged diameter portion 3A. By screwing in the direction of the center P, the presser inner peripheral portion 13 is press-fitted and fitted to a portion of the enlarged diameter main portion 12 that is surrounded by the retaining annular portion 4C, and the enlarged diameter changing region 9 is formed. The seal pressing portion 10 is configured to be pressed in the axial center P direction ,
The retaining annular portion 4C is folded back from the straight barrel portion 4B toward the outside of the diameter of the thin cylindrical portion 4H extending from the straight barrel portion 4B to the tip-end tapered portion 4A side. It is characterized by being formed .

請求項２に係る発明は、請求項１に記載の樹脂管継手において、前記押え内周部１３が、前記拡径主部１２における前記直胴筒部４Ｂに外囲される部分にも圧接外嵌するように構成されていることを特徴とするものである。   According to a second aspect of the present invention, in the resin pipe joint according to the first aspect, the presser inner peripheral portion 13 is also pressed against the portion of the enlarged diameter main portion 12 surrounded by the straight barrel portion 4B. It is comprised so that it may fit.

請求項３に係る発明は、請求項１又は２に記載の樹脂管継手において、前記薄肉筒状部４Ｈの径外側へ向けての折り返しが、前記チューブ３を前記インナ筒４へ外嵌装着する操作に伴って形成されるものであることを特徴とするものである。 According to a third aspect of the present invention, in the resin pipe joint according to the first or second aspect , the tube 3 is externally fitted to the inner cylinder 4 when the thin cylindrical portion 4H is turned back toward the outside of the diameter. It is formed in accordance with the operation.

請求項４に係る発明は、請求項１〜３の何れか一項に記載の樹脂管継手において、前記継手本体１に、前記拡径変化領域９の大径側部分に作用可能な抜止め用押圧部１１が形成されており、前記ユニオンナット２の螺進によって前記拡径変化領域９の大径側部分が前記抜止め用押圧部１１で前記軸心P方向に押圧されるように構成されていることを特徴とするものである。 The invention according to claim 4 is the resin pipe joint according to any one of claims 1 to 3 , wherein the joint main body 1 is used for retaining against the large-diameter side portion of the diameter expansion region 9. A pressing portion 11 is formed, and the large-diameter side portion of the enlarged diameter changing region 9 is pressed in the axial direction P by the retaining pressing portion 11 by the union nut 2 being screwed. It is characterized by that.

請求項１の発明によれば、詳しくは実施形態の項にて説明するが、シール用押圧部が拡径変化領域を押すのでインナ筒部の先端箇所でシール部が形成されることになり、インナ筒部と拡径部との間に流体が入り込むことなくチューブと継手本体とが良好にシールされるようになる。インナ筒部に外嵌されている拡径大径部のうちのより大径となる抜止め環状部がインナ筒部と押え内周部とで圧接されるので、引抜力に強く抗することができるとともに、引抜力に起因して拡径大径部が、即ち抜止め環状部が拡径される構造に起因して径方向に膨張変形することで軸心方向にズリ動こうとすることも阻止されるようになり、拡径部が軸心方向でインナ筒部から抜け出る方向の移動が有効に規制される機能が生じる。   According to the invention of claim 1, it will be described in detail in the section of the embodiment, but the sealing portion is formed at the tip portion of the inner cylinder portion because the sealing pressing portion pushes the diameter expansion change region, The tube and the joint main body are satisfactorily sealed without the fluid entering between the inner cylindrical portion and the enlarged diameter portion. The retaining annular part that has a larger diameter among the large-diameter large-diameter parts that are externally fitted to the inner cylinder part is pressed against the inner cylinder part and the inner periphery of the presser, so that it can resist the pulling force strongly. In addition, the large-diameter portion having a large diameter due to the pulling force, that is, the structure in which the retaining annular portion is expanded, may expand and deform in the radial direction to try to shift in the axial direction. As a result, the function of effectively restricting the movement of the enlarged diameter portion in the direction of coming out of the inner cylindrical portion in the axial direction is produced.

そして、インナ筒部に外嵌されている抜止め環状部がインナ筒部の外周面と押え内周部とで圧接されて逃げ場所が無く（膨張変形等ができない）、押圧力が強化されてしっかりとホールドされるだけでなく、抜止め環状部が拡径大径部にその内周面側から食い込むようになるので、拡径部が軸心方向でインナ筒部から抜け出る方向への移動防止作用が強化され、耐引抜力がより一層向上する。その結果、継手本体とユニオンナットとの２点で成る経済的なものとしながら、かつ、耐引抜性と良好なシール性との両立を図ることが可能となる樹脂管継手を提供することができる。
また、チューブの耐引抜力向上に寄与する抜止め環状部が、インナ筒部と一体形成される張出し筒部の折り返しによって形成されるから、例えば切削による後加工で形成する手段に比べて、加工が楽で廉価に構成することが可能になる、という利点がある。 Then, the retaining annular part fitted on the inner cylinder part is pressed against the outer peripheral surface of the inner cylinder part and the inner peripheral part of the presser, and there is no escape place (expansion deformation cannot be performed), and the pressing force is strengthened. In addition to being firmly held, the retaining annular part bites into the enlarged large diameter part from the inner peripheral surface side, preventing the enlarged diameter part from moving in the axial direction to exit the inner cylinder part. The action is strengthened and the pull-out resistance is further improved. As a result, it is possible to provide a resin pipe joint that is economical and consists of two points of a joint body and a union nut, and that can achieve both resistance to pulling out and good sealing performance. .
In addition, since the retaining annular portion that contributes to improving the pulling-out resistance of the tube is formed by folding the overhanging cylindrical portion that is formed integrally with the inner cylindrical portion, for example, compared to means formed by post-processing by cutting. However, there is an advantage that it can be configured easily and inexpensively.

請求項２の発明によれば、抜止め環状部だけでなく拡径主部もインナ筒部の外周面と押え内周部とで圧接されるので、チューブの耐引抜力がさらに改善される利点がある。   According to the second aspect of the present invention, not only the retaining annular portion but also the enlarged diameter main portion is pressed against the outer peripheral surface of the inner cylindrical portion and the inner peripheral portion of the presser, so that the pull-out resistance of the tube is further improved. There is.

請求項３の発明によれば、チューブのインナ筒部への強制外嵌操作に伴って張出し筒部が折り返されて抜止め環状部となるものであるから、予めの別作業で張出し筒部を折り返して抜止め環状部とさせておく場合に比べて、工数削減による組付効率向上やコストダウンが可能となる利点が得られる。 According to the invention of claim 3 , since the overhanging cylinder part is folded back to become a retaining annular part in accordance with the forced external fitting operation of the tube to the inner cylinder part, Compared with the case where it is folded back and used as a retaining annular portion, there are obtained advantages that assembly efficiency can be improved and costs can be reduced by reducing the number of man-hours.

請求項４の発明によれば、拡径大径部に押え内周部が圧接外嵌される状態で、抜止め用押圧部が拡径変化領域の大径側部分を押すので、ユニオンナットの締付に伴って拡径大径部を内奥側に積極的に押込むという好ましい作用も生じ、チューブをよりしっかりと奥まで差し込むことに寄与する効果がある。そして、押え内周部の圧接外嵌によってチューブは容易には内奥に動けない状況にあるから、抜止め用押圧部の前記押し込みで拡径大径部の厚みが増大しようとする作用が生まれ、それによって直胴筒部と押え内周部との間で拡径大径部がより強固に挟持されて、耐引抜力が一層向上することも可能になる。 According to the invention of claim 4 , the retaining pressing portion presses the large-diameter side portion of the diameter-enlargement change region in a state where the presser inner peripheral portion is press-fitted and fitted to the enlarged-diameter large-diameter portion. Along with the tightening, a preferable action of positively pushing the enlarged diameter large diameter portion into the inner back side also occurs, and there is an effect that contributes to more firmly inserting the tube to the back. Since the tube is not easily moved inward due to the press-fitting outer fit of the inner periphery of the presser foot, there is an effect of increasing the thickness of the large-diameter large-diameter portion by the pushing of the retaining pressing portion. As a result, the large-diameter large-diameter portion is more firmly sandwiched between the straight barrel portion and the inner circumferential portion of the presser, and the pull-out force can be further improved.

実施例１による樹脂管継手の構造を示す断面図Sectional drawing which shows the structure of the resin pipe joint by Example 1 図１におけるシール部周辺を示す部分拡大図Partial enlarged view showing the periphery of the seal portion in FIG. 継手本体の抜止め環状部が形成される工程を示す作用図Operational diagram showing the process of forming the retaining annular part of the joint body インナ筒部にチューブが外嵌装着された状態を示す要部の断面図Sectional drawing of the principal part which shows the state by which the tube was externally attached by the inner cylinder part.

以下に、本発明による樹脂管継手の実施の形態を、図面を参照しながら説明する。   Embodiments of a resin pipe joint according to the present invention will be described below with reference to the drawings.

〔実施例１〕
実施例１による樹脂管継手Ａは、図１，図２に示すように、フッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製のチューブ３をポンプ、バルブ等の流体機器や、異径又は同径のチューブに連通接続するものであり、フッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製の継手本体１とフッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製ユニオンナット２との２部品で構成されている。尚、図１，２はユニオンナット２を所定量締め込んだ組付状態を示している。 [Example 1]
As shown in FIGS. 1 and 2, the resin pipe joint A according to Example 1 includes a tube 3 made of a fluororesin (an example of a synthetic resin typified by PFA, PTFE, etc.), a fluid device such as a pump and a valve, A joint body 1 made of fluororesin (an example of a synthetic resin typified by PFA, PTFE, etc.) and a fluororesin (synthetic resin typified by PFA, PTFE, etc.) are connected to tubes of different diameters or the same diameter. An example) It is comprised by two parts with the union nut 2 made from. 1 and 2 show an assembled state in which the union nut 2 is tightened by a predetermined amount.

継手本体１は、図１，図２に示すように、チューブ３の端部を拡径して外嵌装着可能な一端のインナ筒部４と、インナ筒部４の内奥側部分の外周側に拡径されたチューブ３先端の入り込みを許容すべく軸心Ｐ方向に延びる周溝ｍを有して被さるカバー筒部６と、台形ねじで成る雄ねじ５と、軸心Ｐを持つ円柱空間状の流体経路７とを備える筒状部材に形成されている。インナ筒部４は、チューブ３を徐々に拡径させる先端先窄まり筒部４Ａ、先端先窄まり筒部４Ａの大径側に続いて形成される直胴筒部４Ｂ、及び直胴筒部４Ｂの先端先窄まり筒部側に直胴筒部４Ｂよりも大径の状態で形成される抜止め環状部４Ｃを有して軸心Ｐ方向に突設されている。   As shown in FIGS. 1 and 2, the joint main body 1 has an inner cylinder portion 4 at one end that can be fitted and expanded by expanding the end portion of the tube 3, and the outer peripheral side of the inner back side portion of the inner cylinder portion 4. A cylindrical cylindrical space having a cover cylinder portion 6 having a circumferential groove m extending in the direction of the axis P to allow the tip of the tube 3 having a diameter expanded to a diameter, a male screw 5 formed of a trapezoidal screw, and the axis P And a fluid path 7. The inner cylinder portion 4 includes a tip-end tapered cylinder portion 4A that gradually expands the diameter of the tube 3, a straight barrel cylinder portion 4B that is formed on the large diameter side of the tip-tip tapered cylinder portion 4A, and a straight barrel cylinder portion. 4B has a retaining annular portion 4C formed with a diameter larger than that of the straight barrel portion 4B on the side of the tapered tip portion of 4B, and protrudes in the axis P direction.

周溝ｍは、その径内側の周面である外周面は直胴筒部４Ｂの外周面４ｂであり、その径外側の周面である外周面はカバー筒部６の内周面６ａである。周溝ｍの奥側周面１８から軸心Ｐ方向に所定長さ離れた箇所に継手フランジ１Ａが形成されており、その継手フランジ１Ａの略根元部位からカバー筒部６の端部の外周面に亘って雄ねじ５が形成されている。インナ筒部４の先端面は、径方向で内側ほど内奥側（軸心Ｐ方向で奥側）に寄る逆テーパの角度が施される、即ち、先端ほど大径となるカット面１６が形成されており、チューブ３の内周面が拡径部（フレア部）に向けて拡がり変位することに因る液溜り周部１７の形状を内周側拡がり形状として、その流体が液溜り周部１７に停滞し難くしてある。尚、カット面１６は、その最大径が自然状態のチューブ３の外径と略等しくなるように形成されているが、それにはこだわらない。   In the circumferential groove m, the outer peripheral surface that is the inner peripheral surface of the diameter is the outer peripheral surface 4b of the straight barrel portion 4B, and the outer peripheral surface that is the outer peripheral surface of the diameter is the inner peripheral surface 6a of the cover cylindrical portion 6. . A joint flange 1A is formed at a position away from the inner peripheral surface 18 of the circumferential groove m in the axial center P direction by a predetermined length, and the outer peripheral surface of the end portion of the cover tube portion 6 from the substantially root portion of the joint flange 1A. A male screw 5 is formed over the entire area. The tip surface of the inner cylinder part 4 is formed with a reverse taper angle that is closer to the inner inner side (the inner side in the direction of the axis P) toward the inner side in the radial direction. The shape of the liquid reservoir peripheral portion 17 due to the inner peripheral surface of the tube 3 being expanded and displaced toward the enlarged diameter portion (flare portion) is defined as the inner peripheral side expanded shape, and the fluid is stored in the liquid peripheral portion. 17 is difficult to stay. The cut surface 16 is formed so that its maximum diameter is substantially equal to the outer diameter of the tube 3 in the natural state, but this is not particular.

直胴筒部４Ｂの先端先窄まり筒部４Ａ側に形成されている抜止め環状部４Ｃは、インナ筒部４とユニオンナット２とで径内外で挟まれるチューブ３の拡径部３Ａを径内側から径外側に押圧する部分であり、直胴筒部４Ｂの先端先窄まり筒部側端部を大径化するような機能を有している。次に、抜止め環状部４Ｃの作り方について説明する。   The retaining annular portion 4C formed on the side of the straight barrel portion 4B on the side of the tapered tip portion 4A has the diameter of the enlarged portion 3A of the tube 3 sandwiched between the inner cylinder portion 4 and the union nut 2 inside and outside the diameter. This is a portion that is pressed from the inside to the outside of the diameter, and has a function of increasing the diameter of the end portion of the straight barrel portion 4B. Next, how to make the retaining annular portion 4C will be described.

まず、図３（ａ）に示すように、継手本体１の形成時は、抜止め環状部４Ｃは、直胴筒部４Ｂの先端先窄まり筒部４Ａ側端から直胴筒部４Ｂと同外径で軸心Ｐ方向に延設される薄肉の張出し筒部４Ｈとして一体形成されている。この顕著に肉厚の薄い張出し筒部４Ｈを、手指や工具等によってその付け根を軸として仮想線で示すように径外側に強制的に折り曲げ変形させることにより、図３（ｂ）に示すように、直胴筒部４Ｂの外周面４ｂにへばり付くまで折り返されて抜止め環状部４Ｃが形成される。この場合、継手本体１の材料（フッ素樹脂）の持つ粘性（靭性）により、折り曲げ根元部分は小さな曲率による湾曲形状を呈している。   First, as shown in FIG. 3A, when the joint body 1 is formed, the retaining annular portion 4C is the same as the straight barrel portion 4B from the end of the straight barrel portion 4B. It is integrally formed as a thin overhanging cylindrical portion 4H having an outer diameter and extending in the direction of the axis P. As shown in FIG. 3 (b), the projecting cylindrical portion 4H having a remarkably thin thickness is forcibly bent and deformed outwardly with a finger or a tool as indicated by a virtual line with the root as an axis. Then, it is folded until it sticks to the outer peripheral surface 4b of the straight barrel portion 4B, so that a retaining annular portion 4C is formed. In this case, due to the viscosity (toughness) of the material (fluororesin) of the joint body 1, the bent root portion has a curved shape with a small curvature.

そして、図３（ｂ）に示す状態のインナ筒部４にチューブ３を強制外嵌させることにより、図３（ｃ）に示すように、拡径部３Ａ（拡径変化領域９を含む）が形成されてインナ筒部４に外嵌された装着状態が得られる。つまり、抜止め環状部４Ｃが、直胴筒部４Ｂからこれと外径を同じくして先端先窄まり筒部４Ａ側に延設される張出し筒部（薄肉筒状部の一例）４Ｈの径外側へ向けて折り返されて形成されるものである。尚、図３（ａ）に示す張出し筒部４Ｈを有するインナ筒部４にチューブ３を強制外嵌する操作により、張出し筒部４Ｈを折り返しながらチューブ３を差し込み、図３（ｃ）に示すように折り返された抜止め環状部４Ｃに外嵌する装着状態とすることも可能（白抜き矢印イ参照）である。   Then, the tube 3 is forcibly externally fitted to the inner cylindrical portion 4 in the state shown in FIG. 3B, so that the enlarged diameter portion 3A (including the enlarged diameter change region 9) is obtained as shown in FIG. A mounted state formed and externally fitted to the inner cylinder portion 4 is obtained. In other words, the retaining annular portion 4C has the same diameter as that of the straight barrel portion 4B, and the diameter of the overhanging tubular portion (an example of a thin tubular portion) 4H that extends toward the cylindrical portion 4A. It is formed by being folded back toward the outside. In addition, by the operation of forcibly fitting the tube 3 to the inner cylinder part 4 having the overhanging cylinder part 4H shown in FIG. 3A, the tube 3 is inserted while the overhanging cylinder part 4H is folded back, as shown in FIG. 3C. It is also possible to make it a state of being fitted to the retaining annular portion 4C that is folded back (see the white arrow a).

図４は、チューブ３がインナ筒部４に外嵌装着された状態におけるチューブ３の抜止め環状部４Ｃ付近における外嵌状況を示す拡大断面図である。これから分かるように、チューブ３を強制外嵌させただけの状態では、チューブ３の材料が持つ粘性（靭性）により、図３（ｂ）に示される状態よりは深く折り曲げられるが、依然として抜止め環状部４Ｃの根元湾曲部が維持されている。   FIG. 4 is an enlarged cross-sectional view illustrating an external fitting state in the vicinity of the retaining annular portion 4 </ b> C of the tube 3 in a state where the tube 3 is externally fitted to the inner cylinder portion 4. As can be seen from this, in the state in which the tube 3 is only forcedly fitted, it is bent deeper than the state shown in FIG. 3B due to the viscosity (toughness) of the material of the tube 3, but it is still a retaining ring. The base curved portion of the portion 4C is maintained.

ユニオンナット２は、図１，図２に示すように、雄ねじ５に螺合可能な雌ねじ８と、チューブ３のインナ筒部４に外嵌される拡径部３Ａにおける拡径変化領域９の小径側部分に作用可能なシール用周エッヂ（シール用押圧部の一例）１０と、拡径変化領域９の大径側部分に作用可能な抜止め用周エッヂ（抜止め用押圧部の一例）１１と、拡径部３Ａにおける抜止め環状部４Ｃと直胴筒部４Ｂとに外囲される拡径大径部（拡径主部の一例）１２に外嵌可能な押え内周部１３と、シール用周エッヂ１０に続いてチューブ３を軸心Ｐ方向の所定長さに亘って外囲するガイド筒部１４とを備えて形成されている。   As shown in FIGS. 1 and 2, the union nut 2 includes a female screw 8 that can be screwed into the male screw 5, and a small diameter of an enlarged diameter changing region 9 in the enlarged diameter portion 3 </ b> A that is externally fitted to the inner cylindrical portion 4 of the tube 3. A peripheral edge for sealing (an example of a pressing portion for sealing) 10 that can act on the side portion, and a peripheral edge for retaining (an example of a pressing portion for retaining) 11 that can act on the large-diameter side portion of the enlarged diameter change region 9 And a presser inner peripheral portion 13 that can be externally fitted to a large-diameter large-diameter portion (an example of a large-diameter main portion) 12 that is surrounded by the retaining annular portion 4C and the straight barrel portion 4B in the large-diameter portion 3A, Following the peripheral edge 10 for sealing, the tube 3 is formed with a guide cylinder portion 14 surrounding the tube 3 over a predetermined length in the axis P direction.

シール用周エッヂ１０は、その内径がチューブ３の外径に略等しく、その押圧面１０ａは軸心Ｐに直交する側周面とされている。抜止め用周エッヂ１１は、その内周面の径が直胴筒部４Ｂの外径と略等しく設定されているが、それより大径又は小径でも良く、要は拡径変化領域９の大径側部分に作用するように構成されておれれば良い。抜止め用周エッヂ１１の押圧面１１ａも軸心Ｐに直交する側周面である。   The sealing peripheral edge 10 has an inner diameter substantially equal to the outer diameter of the tube 3, and the pressing surface 10 a is a side peripheral surface orthogonal to the axis P. The diameter of the inner peripheral surface of the retaining peripheral edge 11 is set to be substantially equal to the outer diameter of the straight body cylinder portion 4B, but it may be larger or smaller than that. What is necessary is just to be comprised so that it may act on a diameter side part. The pressing surface 11a of the retaining peripheral edge 11 is also a side peripheral surface orthogonal to the axis P.

押え内周部１３は、これと拡径大径部１２とに径方向の隙間が無く、かつ、ユニオンナット２の締込みによる拡径部３Ａの連れ回りが生じない程度に拡径大径部１２に圧入（圧接外嵌）される値に設定されて抜止め手段Ｎが構成されている。これにより、拡径部３Ａにおける抜止め環状部４Ｃに外嵌される部分は、より強い径方向の圧接力が作用するようになっている。従って、ユニオンナット２の締込みにより、押え内周部１３が拡径部３Ａを強制縮径させて湾曲状態にある抜止め環状部４Ｃを直胴筒部４Ｂの外周面に全接触する根元からの屈曲状態にするとともに、その抜止め環状部４Ｃ及び直胴筒部４Ｂと押え内周部１３とで拡径部３Ａ（チューブ３）が強く圧接され、耐引抜力が高められている。   The inner diameter portion 13 of the presser has a large-diameter large-diameter portion so that there is no gap in the radial direction between the large-diameter portion 12 and the large-diameter portion 12 so that the enlarged-diameter portion 3A is not rotated by tightening of the union nut 2. 12 is set to a value that is press-fitted into 12 (press-fit external fitting), and the retaining means N is configured. As a result, a stronger radial pressing force acts on a portion of the enlarged diameter portion 3A that is externally fitted to the retaining annular portion 4C. Therefore, by tightening the union nut 2, the presser inner peripheral portion 13 forcibly contracts the diameter-expanded portion 3A and the retaining annular portion 4C in a curved state comes into contact with the outer peripheral surface of the straight barrel portion 4B. In addition, the diameter-enlarging portion 3A (tube 3) is strongly pressed by the retaining annular portion 4C and the straight barrel portion 4B and the presser inner peripheral portion 13 to enhance the pull-out resistance.

次に、チューブ３の端部をインナ筒部４に外嵌挿入するには、常温下で強制的にチューブ３を押し込んで拡径させて装着するか、熱源を用いて暖めて膨張変形し易いようにしてから押し込むか、或いは拡径器（図示省略）を用いて予めチューブ端を拡径させておいてからインナ筒部４に押し込むかして、図１に示すように、抜止め環状部４Ｃを乗越えてチューブ端３ｔがカバー筒部６の端壁１５よりも内奥に位置する状態となるまで差し込む。インナ筒部４に外嵌装着される拡径部３Ａは、図１，図２に示すように、先端先窄まり筒部４Ａの外周面４ａに外嵌される拡径変化領域９と、直胴筒部分４Ｂの外周面４ｂに外嵌される拡径大径部１２とで成る。拡径大径部１２は、抜止め環状部４Ｃに外嵌される膨出径部１２Ａに外嵌される部分を含んでいる。   Next, in order to externally insert and insert the end of the tube 3 into the inner cylinder portion 4, the tube 3 is forcibly pushed in at room temperature to expand the diameter, or it is easily heated and expanded using a heat source. As shown in FIG. 1, the retaining annular portion is pushed in, or the tube end is expanded in advance using a diameter expander (not shown) and then pushed into the inner cylinder portion 4. 4C is inserted, and it inserts until the tube end 3t will be in the state located in the inner back rather than the end wall 15 of the cover cylinder part 6. FIG. As shown in FIGS. 1 and 2, the enlarged-diameter portion 3A that is externally fitted to the inner cylinder portion 4 includes an enlarged-diameter changing region 9 that is fitted on the outer peripheral surface 4a of the cylindrical portion 4A. It consists of the enlarged diameter large diameter part 12 fitted on the outer peripheral surface 4b of the barrel part 4B. The expanded large diameter portion 12 includes a portion that is externally fitted to the bulging diameter portion 12A that is externally fitted to the retaining annular portion 4C.

つまり、図１，図２に示すように、インナ筒部４にチューブ３が外嵌装着された状態における雌ねじ８を雄ねじ５に螺合させての抜止め環状部４Ｃ及び直胴筒部分４Ｂに外囲される拡径大径部１２に押え内周部１３が外嵌され、かつ、拡径変化領域９の大径側部分が抜止め用周エッヂ１１で軸心Ｐ方向に押圧され、かつ、拡径変化領域９の小径側部分がシール用周エッヂ１０で軸心Ｐ方向に押圧されるように設定されている。尚、チューブ３の流体移送路３Ｗの径と流体経路７の径とは、円滑な流体の流れとすべく互いに同径に設定されているが、互いに異なっていても良い。   That is, as shown in FIGS. 1 and 2, the retaining ring portion 4 </ b> C and the straight barrel portion 4 </ b> B are formed by screwing the female screw 8 with the male screw 5 in a state where the tube 3 is externally fitted to the inner cylindrical portion 4. A presser inner peripheral portion 13 is externally fitted to the outer diameter-enlarged large-diameter portion 12, and the large-diameter side portion of the diameter-enlargement change region 9 is pressed in the axial center P direction by the retaining peripheral edge 11, and The small diameter side portion of the diameter expansion change region 9 is set to be pressed in the direction of the axis P by the sealing peripheral edge 10. Note that the diameter of the fluid transfer path 3W of the tube 3 and the diameter of the fluid path 7 are set to be the same diameter in order to obtain a smooth fluid flow, but may be different from each other.

さて、図１，図２に示すように、樹脂管継手Ａの所定の組付け状態においては、シール用周エッヂ１０はチューブ３の拡径変化領域９の小径側端部分を軸心Ｐ方向に押圧するので、先端先窄まり筒部４Ａの外周面４ａの小径側端と、その箇所に接するチューブ３（即ち拡径変化領域９）の内周面とが強く圧接されてシール部Ｓが形成される。このインナ筒部４の先端箇所でのシール部Ｓにより、インナ筒部４と拡径部３Ａとの間に洗浄液、薬液等の流体が入り込むことなくチューブ３と継手本体１とが良好にシールされる。   As shown in FIGS. 1 and 2, in a predetermined assembled state of the resin pipe joint A, the sealing peripheral edge 10 has the small diameter side end portion of the diameter expansion change region 9 of the tube 3 in the axis P direction. Since the pressure is applied, the small diameter side end of the outer peripheral surface 4a of the cylindrical portion 4A having a tapered tip is strongly pressed against the inner peripheral surface of the tube 3 (that is, the expanded diameter changing region 9) in contact therewith to form the seal portion S. Is done. By the seal portion S at the tip of the inner cylinder portion 4, the tube 3 and the joint main body 1 are well sealed without any fluid such as cleaning liquid or chemical liquid entering between the inner cylinder portion 4 and the enlarged diameter portion 3A. The

そして、拡径大径部１２のうちの抜止め環状部４Ｃの径外側に位置する部分が、直胴筒部分４Ｂと押え内周部１３とでより強く囲まれて、まず膨張変形できないようにホールドされており、かつ、抜止め用周エッヂ１１がほぼその拡径大径部１２に食い込むように位置している。これにより、拡径変化領域９の大径側端部分、即ち実質的に拡径大径部１２に食い込むように押す抜止め用周エッヂ１１の引掛かり、及び抜止め環状部４Ｃが拡径大径部１２の始端側に径内側から食い込むようにしてより径方向で強く挟持することにより、拡径部３Ａに作用する引抜力に強固に抗することができる。加えて、抜止め用周エッヂ１１を基点として拡径大径部１２が引抜力により、径方向に膨張変形できることに起因して拡径部３Ａが抜き出る方向にずり動くことが牽制阻止されるようにもなる。   And the part located outside the diameter of the retaining annular part 4C in the enlarged diameter part 12C is more strongly surrounded by the straight body cylinder part 4B and the presser inner peripheral part 13 so that it cannot be expanded and deformed first. The retaining peripheral edge 11 is positioned so as to substantially bite into the enlarged diameter portion 12. As a result, the catch of the retaining peripheral edge 11 and the retaining annular portion 4 </ b> C having a large diameter increase are arranged so as to bite into the large-diameter side end portion of the diameter-expansion changing region 9, that is, the diameter-enlarging large-diameter portion 12. By pulling into the starting end side of the diameter portion 12 from the inside of the diameter and holding it more strongly in the radial direction, the pulling force acting on the enlarged diameter portion 3A can be strongly resisted. In addition, the enlarged diameter large diameter portion 12 can be restrained from sliding in the direction in which the enlarged diameter portion 3A is pulled out due to the expansion force of the enlarged diameter large diameter portion 12 being radially expanded by the pulling force with the retaining peripheral edge 11 as a base point. It becomes like.

拡径部３Ａが軸心Ｐ方向に少しでもずり動くと、シール部Ｓにおけるシールポイントもずれてシール機能が不確実化するおそれがあるが、それが未然に防止されるようになる。従って、拡径部３Ａが軸心Ｐ方向でインナ筒部４から抜け出る方向の移動が強固に規制される抜止め手段Ｎが構成されており、それによって優れた耐引抜力が実現されている。その結果、継手本体１とユニオンナット２とから成るフレア型の樹脂管継手Ａを、チューブがインナ筒部に装着されている状態でのナット操作によって簡単に組付けできて組付性に優れるとともに、シール部Ｓによる優れたシール性と抜止め手段Ｎによる優れた耐引抜力との両立も図れる改善されたものとして実現できている。   If the diameter-enlarged portion 3A is displaced in the axial center P direction even a little, the seal point in the seal portion S may be shifted and the seal function may be uncertain, but this is prevented in advance. Therefore, the retaining means N in which the movement in the direction in which the diameter-enlarged portion 3A is pulled out from the inner cylinder portion 4 in the direction of the axis P is firmly restricted is configured, thereby realizing an excellent pull-out resistance. As a result, the flare-type resin pipe joint A composed of the joint body 1 and the union nut 2 can be easily assembled by a nut operation in a state where the tube is mounted on the inner cylinder portion, and has excellent assemblability. Thus, it has been realized as an improved structure that can achieve both excellent sealing performance by the seal portion S and excellent pull-out resistance by the retaining means N.

加えて、抜止め用周エッヂ１１による拡径変化領域９の大径側部分の押圧が開始された後にシール用周エッヂ１０による拡径変化領域９の小径側部分の押圧が開始される状態に設定、即ち押圧時差手段を盛り込めば、次のような作用や効果も追加される。即ち、ユニオンナット２を回して締め込んで（螺進させて）ゆくと、まず、抜止め用周エッヂ１１が先に拡径変化領域９（詳しくは拡径変化領域９の大径側部分）に当接し、そのときはシール用周エッヂ１０は拡径変化領域９にまだ達していない。これにより、抜止め用周エッヂ１１のみが拡径変化領域９の大径側部分を軸心Ｐ方向に押すから、ユニオンナット２の締付操作によって拡径大径部１２をインナ筒部４のより内奥側に押し込もうとする作用が生じる。   In addition, after the pressing of the large-diameter side portion of the enlarged-diameter changing region 9 by the retaining peripheral edge 11 is started, the pressing of the small-diameter side portion of the enlarged-diameter changing region 9 by the sealing peripheral edge 10 is started. If the setting, that is, pressing time difference means is included, the following actions and effects are also added. That is, when the union nut 2 is turned and tightened (screwed), the retaining peripheral edge 11 is first moved to the diameter expansion region 9 (specifically, the large diameter side portion of the diameter expansion region 9). At that time, the peripheral edge 10 for sealing has not yet reached the diameter expansion change region 9. As a result, only the retaining peripheral edge 11 pushes the large diameter side portion of the diameter expansion change region 9 in the direction of the axis P, so that the diameter expansion large diameter portion 12 of the inner cylinder portion 4 is tightened by the union nut 2 tightening operation. The action which tries to push more inward is produced.

直胴筒部４Ｂに圧入外嵌される拡径大径部１２は押え内周部１３にも圧接されるが、その圧接力が比較的弱い場合には拡径部３Ａをズリ動かしてインナ筒部４のより内奥側に挿入させようとするから、より確実にチューブ３を継手本体１に差し込めるとか、それに加えて、軸心Ｐ方向に押される拡径大径部１２が軸心Ｐ方向に動きに難いことに起因して径方向に膨張しようとして、より圧接力が高まってしっかりと挟持される作用が生じるといった好ましい効果が得られる。前記圧接力が比較的強い場合には、軸心Ｐ方向に押される拡径大径部１２が軸心Ｐ方向にまず動けないことによって径方向に膨張しようとする強い作用が生じ、インナ筒部４と押え内周部１３との間で拡径大径部１２がより一層強固に保持される効果が得られる。   The large-diameter large-diameter portion 12 that is press-fitted and fitted into the straight barrel portion 4B is also pressed against the presser inner peripheral portion 13, but when the pressure-contact force is relatively weak, the inner-diameter tube is moved by shifting the large-diameter portion 3A. Since the tube 3 is to be inserted further into the inner portion of the portion 4, the tube 3 can be more reliably inserted into the joint body 1, or in addition, the enlarged diameter large-diameter portion 12 pushed in the direction of the axis P is provided with the axis P Due to the difficulty in movement in the direction, it is possible to obtain a favorable effect that the pressure contact force is increased and the action of being firmly clamped is generated in an attempt to expand in the radial direction. When the pressure contact force is relatively strong, the large-diameter large-diameter portion 12 pushed in the direction of the axis P does not move first in the direction of the axis P, thereby causing a strong action to expand in the radial direction. An effect is obtained in which the enlarged-diameter large-diameter portion 12 is more firmly held between the presser 4 and the presser inner peripheral portion 13.

また、拡径大径部１２が抜止め環状部４Ｃで局部的により径方向に圧縮されるような状況になることにより、物理的にも拡径部３Ａの抜け方向移動がより一層生じ難くなる。加えて、樹脂管継手Ａに熱が加わったときに合成樹脂（継手本体１やユニオンナット２）の応力緩和が起こってチューブ３が抜け易くなることがあるが、拡径大径部１２が抜止め環状部４Ｃの部分で引っ掛かって抜け規制が行われる作用が生じて抜け方向へのずれ動きが防止される利点もある。   In addition, since the large-diameter large-diameter portion 12 is locally compressed in the radial direction by the retaining annular portion 4C, it is even more difficult to physically move the large-diameter portion 3A in the removal direction. . In addition, when heat is applied to the resin pipe joint A, the stress of the synthetic resin (the joint body 1 and the union nut 2) may be relaxed and the tube 3 may be easily pulled out. There is also an advantage that the movement in the retaining direction is prevented by being caught at the stop annular portion 4C and the displacement is controlled.

つまり、いずれにせよ、シール用周エッヂ１０が拡径部３Ａに刺さり込み作用していない状況で抜止め用周エッヂ１１が拡径部３Ａを軸心Ｐ方向に押すことにより、直胴筒部分４Ｂと押え内周部１３とによる拡径大径部１２の圧接保持力が強化されるという効果が得られる。以上のように、押圧時差手段により、チューブ３のインナ筒部４に対する圧接保持力も耐引抜力も一層向上する効果が得られるようになる。   That is, in any case, when the sealing peripheral edge 10 is not inserted into the expanded diameter portion 3A, the retaining peripheral edge 11 pushes the expanded diameter portion 3A in the direction of the axis P so that the straight barrel portion The effect that the press-contact holding force of the enlarged diameter large diameter portion 12 by the 4B and the presser inner peripheral portion 13 is enhanced is obtained. As described above, the pressing time difference means provides an effect of further improving both the pressure contact holding force of the tube 3 with respect to the inner cylindrical portion 4 and the pull-out resistance.

また、チューブ３の耐引抜力向上に寄与する抜止め環状部４Ｃが、インナ筒部４と一体形成（又は一体成形）される張出し筒部４Ｈの折り返しによって形成されるから、例えば切削による後加工で形成する手段に比べて、加工が楽で廉価に構成することが可能になる。これは、継手本体１の材料がフッ素樹脂等の粘性（靭性）を持つ材料であるが故に可能となる技術である。張出し筒部４Ｈの軸心Ｐ方向長さは、継手本体１の大きさやインナ筒部４の長さ等の緒元に応じて適宜に変更設定することが可能である。   Further, the retaining annular portion 4C that contributes to the improvement of the pull-out resistance of the tube 3 is formed by turning over the overhanging cylindrical portion 4H that is integrally formed (or integrally formed) with the inner cylindrical portion 4, so that, for example, post-processing by cutting Compared with the means formed by the method, the processing is easy and inexpensive. This is a technique that is possible because the material of the joint body 1 is a material having viscosity (toughness) such as a fluororesin. The length in the axial center P direction of the overhanging cylinder portion 4H can be appropriately changed and set according to the specifications such as the size of the joint body 1 and the length of the inner cylinder portion 4.

図１，２に示すように、継手フランジ１Ａから軸心Ｐ方向に延びる複数の片持ち状で薄肉の弾かれ片１９と、ユニオンナット２の先端外周部から軸心Ｐ方向に延びる複数の突起部２０とを形成し、ユニオンナット２を回しての締め込み完了状態又はその付近にて、突起部２０が弾かれ片１９を弾いて音が出る構成としても良い。その弾かれ音にてユニオンナット２の締付が完了したことを作業者に知らしめることが可能となる利点がある。   As shown in FIGS. 1 and 2, a plurality of cantilevered thin-walled repelling pieces 19 extending from the joint flange 1 </ b> A in the axis P direction, and a plurality of protrusions extending from the outer periphery of the tip of the union nut 2 in the axis P direction. It is good also as a structure which forms the part 20 and the protrusion part 20 is bounced and the piece 19 is played in the vicinity of the tightening completion state which turns the union nut 2, or its vicinity. There is an advantage that it is possible to let the operator know that the tightening of the union nut 2 has been completed by the bounce sound.

〔別実施例〕
拡径大径部１２のうち、インナ筒部４と押え内周部１３とで圧接される箇所が抜止め環状部４Ｃに外嵌される部分のみになる樹脂管継手Ａでも良い。また、抜け止め用周エッヂ１１を持たないユニオンナット２を用いた樹脂管継手Ａでも良い。実施例１の樹脂管継手Ａにおいては、押え内周部１３が、拡径部３Ａにおける直胴筒部４Ｂに外囲される部分にも圧接外嵌するように、即ち、抜止め環状部４Ｃ及びそれに続く拡径主部１２との双方に圧接外嵌するように構成されているが、抜止め環状部４Ｃのみ圧接外嵌する構成としても良い。 [Another Example]
Of the expanded large-diameter portion 12, the resin pipe joint A in which the portion that is press-contacted by the inner cylinder portion 4 and the presser inner peripheral portion 13 is only the portion that is externally fitted to the retaining annular portion 4C may be used. Moreover, the resin pipe joint A using the union nut 2 which does not have the peripheral edge 11 for retaining may be used. In the resin pipe joint A of the first embodiment, the presser inner peripheral portion 13 is press-fitted and fitted to a portion surrounded by the straight barrel portion 4B in the enlarged diameter portion 3A, that is, the retaining annular portion 4C. In addition, although it is configured so as to be press-fitted and fitted to both the enlarged diameter main portion 12 and the subsequent enlarged diameter main portion 12, only the retaining annular portion 4C may be fitted to the press-fitting and fitted.

１ 継手本体
２ ユニオンナット
３ チューブ
３Ａ 拡径部
４ インナ筒部
４Ａ 先端先窄まり筒部
４Ｂ 直胴筒部
４Ｃ 抜止め環状部
４Ｈ 薄肉筒状部
５ 雄ねじ
８ 雌ねじ
９ 拡径変化領域
１０ シール用押圧部
１１ 抜止め用押圧部
１２ 拡径主部
１３ 押え内周部 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Union nut 3 Tube 3A Diameter expansion part 4 Inner cylinder part 4A Tip-cone cylinder part 4B Straight body cylinder part 4C Stop ring part 4H Thin-walled cylinder part 5 Male screw 8 Female screw 9 Expansion change area 10 For seal Press part 11 Pressing part for retaining 12 Expanded main part 13 Presser inner peripheral part

Claims (4)

合成樹脂製チューブを徐々に拡径させる先端先窄まり筒部、前記先端先窄まり筒部の大径側に続いて形成される直胴筒部、及び前記直胴筒部の先端先窄まり筒部側に前記直胴筒部よりも大径の状態で形成される抜止め環状部を有するインナ筒部と、雄ねじとを備える合成樹脂製の継手本体、及び
前記雄ねじに螺合可能な雌ねじと、前記チューブの拡径部における拡径変化領域に作用可能なシール用押圧部と、前記拡径部の前記直胴筒部に外囲される拡径主部に外嵌可能な押え内周部と、を備える合成樹脂製のユニオンナットを有し、
前記インナ筒部に前記チューブが外嵌装着されて前記拡径部が形成される状態における前記雌ねじを前記雄ねじに螺合させての前記ユニオンナットの前記継手本体の軸心方向への螺進により、前記拡径主部における前記抜止め環状部に外囲される部分に前記押え内周部が圧接外嵌され、かつ、前記拡径変化領域が前記シール用押圧部で前記軸心方向に押圧されるように構成されており、
前記抜止め環状部が、前記直胴筒部からこれと外径を同じくして前記先端先窄まり筒部側に延設される薄肉筒状部の径外側へ向けて折り返されて形成されるものである樹脂管継手。 A tip tapered tube portion that gradually expands the diameter of the synthetic resin tube, a straight barrel portion that is formed following the large diameter side of the tip tapered tube portion, and a tip tapered portion of the straight barrel tube portion A synthetic resin joint body including an inner cylinder part having a retaining annular part formed on the cylinder part side in a larger diameter than the straight body cylinder part, and a male screw, and a female screw that can be screwed into the male screw A pressing portion for sealing that can act on a diameter-enlargement change region in the diameter-enlarging portion of the tube, and a presser inner circumference that can be externally fitted to the diameter-enlarging main portion surrounded by the straight barrel portion of the diameter-enlarging portion A synthetic resin union nut comprising
By unscrewing the union nut in the axial direction of the joint body by screwing the female screw with the male screw in a state where the tube is fitted on the inner tube portion and the enlarged diameter portion is formed. The inner peripheral portion of the presser is press-fitted to a portion surrounded by the retaining annular portion in the enlarged diameter main portion, and the enlarged diameter changing region is pressed in the axial direction by the seal pressing portion. It is configured to be,
The retaining annular portion is formed by being folded back from the straight barrel portion toward the outer diameter side of the thin cylindrical portion that has the same outer diameter and extends toward the cylindrical portion. resin pipe joint is intended. 前記押え内周部が、前記拡径主部における前記直胴筒部に外囲される部分にも圧接外嵌するように構成されている請求項１に記載の樹脂管継手。   The resin pipe joint according to claim 1, wherein the inner circumferential portion of the presser is configured to be press-fitted and fitted to a portion of the enlarged diameter main portion that is surrounded by the straight barrel portion. 前記薄肉筒状部の径外側へ向けての折り返しが、前記チューブを前記インナ筒へ外嵌装着する操作に伴って形成されるものである請求項１又は２に記載の樹脂管継手。 3. The resin pipe joint according to claim 1, wherein the thin-walled cylindrical portion is turned back toward the outside of the diameter in accordance with an operation of fitting the tube to the inner cylinder. 前記継手本体に、前記拡径変化領域の大径側部分に作用可能な抜止め用押圧部が形成されており、前記ユニオンナットの螺進によって前記拡径変化領域の大径側部分が前記抜止め用押圧部で前記軸心方向に押圧されるように構成されている請求項１〜３の何れか一項に記載の樹脂管継手。 The joint main body is formed with a retaining pressing portion that can act on the large-diameter side portion of the diameter-enlargement change region, and the large-diameter side portion of the diameter-enlargement change region is pulled out by screwing of the union nut. The resin pipe joint as described in any one of Claims 1-3 comprised so that it may press in the said axial direction with the press part for a stop.
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JPH10141564A (en) * 1996-11-15 1998-05-29 Witco Of Jupiter Dentsu Kk Closed connecting method for cylindrical pipes and closing joint
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